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7.2 Signal & ground connection

Manhole covers

Sometimes when locating, it is not possible to insert the

ground stake into the earth, for example, when locating

on hard ground such as roads. In this case, the ground

return can be made by attaching the ground lead to the

metal frame of a manhole.

Using lighting columns

Direct Connecting to a metal, street-lamp column is

almost as effective as connecting to the cable sheath

itself. Normally the cable sheath is bonded to the metal

column, therefore a simple connection onto the column

enables the user to locate the street lighting quickly and

safely without having to call out a technician from the

lighting company.

If the lighting column is made from concrete make the

transmitter connection to the cable sheath unless the

cable is earthed to the inspection doorframe. Connection

to the cable sheath applies the transmitter signal for a

considerable distance enabling the locator to trace

cables feeding illuminated street furniture as well as

other street lights.

WARNING! The live cable connector is for use only by

operators licensed or permitted to work on live cables.

The use of a street light column as a means of applying

a signal to other power cables on the same electric

circuit is a possibility. The signal may be weak using this

method because it may have travelled some distance

back to the sub-station and out again on the other

system. With the locator used on a high sensitivity

setting it is often possible to locate a cable, which would

otherwise have been difficult or inconvenient to energize

with the transmitter signal.

Radiodetection RD8100 User Manual

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